Organ-bellows tension-evener



(No Model.)

R. A. GALLY. ORGANBELLOWS TENSION EVBNER.

No. 546,956. Patented Sept. 24, 1895' I INVENTOI? WITNESSES:

ANDREW B.GRAMAM PHOTO-UTHQWASHINGTON, D11.

STATES Fries.

ATE?

ORGAN-BELLOWS TENSlON-EVfiNER.

SPECIFICATION forming part of Letters Patent No. 546,956, dated September 24, 1895.

Original application filed February 12, 1895, $erial No. 538,122. Divided and this application filed July 18 1895. Serial No. 556,358- (No model.)

To all whom it may concern.-

Be it known that I, ROBERT A. GALLY, a citizen of the United States, residing at Brooklyn, in the county of Kings, State of New York, have invented certain new and useful Improvements in Organ -Bellows Tension- Eveners, of which the following is a specification, reference being had therein to the accompanying drawings.

This specification is a divided portion of my original application, Serial No. 538,122, filed February 12, 1895, for improvements in pneumatic musical instruments.

Figure l is an end View, partly sectional, showing an exhaust-wind organ-bellows with my device applied. Fig. 2 is a form of tension-evener without levers.

By careful calculation the spring itself may be made to act without levers, as shown in Fig. 2, where by having the bearing-points m n of the spring S placed at the proper angle to the line of movement of the point m the leverage of the spring is decreased as the bellows is closed, as shown by the dotted lines.

It is desirable in many organs, and espe cially those which are pneumatic or self-playing, to have an even. tension of wind at all times, and as the change of fold on a common bellows varies the tension I arrange the movement of the bellows to alter the resistance of the spring and compensate the variation of air-tension which would otherwise occur. Many forms of mechanical leverage may be utilized in the application of this system in 5 various cases.

The bellows in Fig.1 shows a desirable form of construction for an ordinary exhaust-bellows. The lever L turns on a stationary pivot at Z and is connected to bellows-board B by short lever T. The spring S is placed to bear against lever L and, through lever T, resist the movement of bellows-board B. As the bellows closes and tension of air would increase from change of position of fold F, the lever T more easily overcomes the spring resistance as it approaches to the position shown by the dotted lines, the spring-pressure on the bellows-board being thus decreased to compensate the variation of air-tension which would otherwise occur from the change of fold F. The form of leverage may be varied to suit the particular form of bellows used.

What I claim as my invention is- 1. A spring acting on a bellows by means of leverage, the movement of the bellowsboard shifting the leverage to alter the force of the spring against the bellows to compensate the change of area or position of the bellows fold or the increased tension of the spring.

' 2. A bellows spring having its bearing points on a line at an angle to the line described by the moving point, the angle being changed by the movement of the bellows, thereby altering the spring force against the bellows and compensating the change of area or position of the bellows-fold or the increased tension of the spring.

ROBT. A. GALLY.

Witnesses:

SUSIE M. GALLY, MERRITT GALLY. 

